Display apparatus including organic electroluminescence devices

ABSTRACT

Provided is a display apparatus and a method of manufacture. The display apparatus includes a first substrate with a plurality of organic electroluminescence devices, a second substrate with a color filter, the second substrate facing the first substrate, and an adhesive layer disposed between the first substrate and the second substrate so as to cover the plurality of organic electroluminescence devices, the adhesive layer being made of a material selected from the group consisting of a phenol resin, a melanin resin, an unsaturated polyester resin, an epoxy resin, a silicon resin and a polyurethane resin.

CROSS REFERENCES TO RELATED APPLICATIONS

The present application is a continuation application of U.S. patentapplication Ser. No. 15/221,197, filed on Jul. 27, 2016, whichapplication is a divisional application of U.S. patent application Ser.No. 14/498,349, filed on Sep. 26, 2014, which application is acontinuation of U.S. patent application Ser. No. 14/185,574 filed onFeb. 20, 2014, and issued as U.S. Pat. No. 8,896,203 on Nov. 25, 2014,which is a continuation of U.S. patent application Ser. No. 13/707,194filed on Dec. 6, 2012, which is a continuation of U.S. patentapplication Ser. No. 13/456,320 filed on Apr. 26, 2012 and issued asU.S. Pat. No. 8,519,622 on Aug. 27, 2013, which is a continuation ofU.S. application Ser. No. 12/873,983 filed on Sep. 1, 2010 and issued asU.S. Pat. No. 8,179,038 on May 15, 2012, which is a continuation of U.S.application Ser. No. 11/899,489 filed on Sep. 6, 2007 and issued as U.S.Pat. No. 7,828,617 on Nov. 9, 2010, which is a continuation of U.S.application Ser. No. 11/441,874, filed on May 26, 2006 and issued asU.S. Pat. No. 7,282,856 on Oct. 16, 2007, which is a continuation ofU.S. application Ser. No. 10/240,358, filed on May 12, 2003 and issuedas U.S. Pat. No. 7,071,619 on Jul. 4, 2006, which is a National Stage ofInternational Application No. PCT/JP02/04611 filed on May 13, 2002, ofwhich claims priority to Japanese Patent Application No. 2001-336772filed on Nov. 1, 2001 and to Japanese Patent Application No. 2002-059040filed on Mar. 5, 2002, the entire contents of which are herebyincorporated by reference.

BACKGROUND

The present disclosure relates to a display apparatus comprising a drivepanel including an organic electroluminescence device (organic ELdevice) disposed on a substrate for drive and a sealing panel, which arebonded together with an adhesive layer.

In recent years, organic EL displays using an organicelectroluminescence device as an alternative to liquid crystal displayshave become a focus of attention. The organic EL displays are of aself-luminous type, so it is considered that the organic EL displayshave advantages of a wide viewing angle, low power consumption andadequate response to high-definition high-speed video signals.Therefore, the organic EL displays have been developed to achieve thepractical use thereof.

A known organic electroluminescence device includes, for example, afirst electrode, an organic layer having a light-emitting layer, and asecond electrode which are laminated in this order on a substrate fordrive. The organic electroluminescence device are sealed by thesubstrate for drive and a substrate for sealing facing the substrate fordrive with an adhesive layer made of, for example, an ultraviolet cureresin in between (For example, Japanese Unexamined Patent ApplicationPublication No. Hei 5-182759, Japanese Unexamined Patent ApplicationPublication No. Hei 11-40345, Japanese Unexamined Patent ApplicationPublication No. Hei 11-297476, Japanese Unexamined Patent ApplicationPublication No. 2000-68049 and so on). Further, in order to prevent theoccurrence of a non-light emitting area (dark spot), the organicelectroluminescence device is typically covered with, for example, aninorganic protective film (For example, Japanese Unexamined PatentApplication Publication No. Hei 11-40345, Japanese Unexamined PatentApplication Publication No. Hei 11-297476, Japanese Unexamined PatentApplication Publication No. 2000-68049, Japanese Patent No. 3170542 andso on). In such an organic electroluminescence device, light generatedin the light-emitting layer may be extracted from the side of thesubstrate for drive or the side of the second electrode depending uponthe type of display.

However, in the organic EL display using such an organicelectroluminescence device, there is a problem that the reflection ofexternal light in a wiring electrode disposed in the organicelectroluminescence device and between the organic electroluminescencedevices is large, thereby resulting in reduced contrast as a display.Therefore, it has been considered that a color filter or areflected-light absorbing film is provided to prevent the reflection ofexternal light. It has been reported that in the case of a display ofthe type which extracts light from the side of the substrate for drive,the color filter or the like is disposed on the substrate for drive, anda layer made of an ultraviolet cure resin is formed and cured on thecolor filter to form the organic electroluminescence device (JapaneseUnexamined Patent Application Publication No. Hei 11-260562). Moreover,it has been reported that after the organic electroluminescence deviceis formed on the substrate for drive, while the organicelectroluminescence device is sealed with the layer made of anultraviolet cure resin and a substrate for sealing, a supplementarysubstrate including the color filter, etc. is disposed on the side ofthe substrate for drive, and a layer made of the ultraviolet cure resinis disposed only on an edge portion to bond the substrate for drive andthe supplementary substrate together (Japanese Unexamined PatentApplication Publication No. Hei 11-345688).

On the other hand, in the case of a display of the type which extractslight from the side of the second electrode, the color filter isdisposed on the side of the substrate for sealing which seals theorganic electroluminescence device. However, in the display of thistype, the transmittance of ultraviolet radiation with a wavelength of430 nm or less through the color filter and the reflected-lightabsorbing film to is low, so it is difficult to cover the organicelectroluminescence device and bond the substrate for sealing with theultraviolet cure resin, like the display of the conventional type whichextracts light from the side of the substrate for drive.

In view of the foregoing, it is an object to provide a display apparatusof the type which extracts light from the side of the second electrodecomprising a drive panel including an organic electroluminescence deviceand a sealing panel including a color filter which are easily bondedtogether.

SUMMARY

A display apparatus according to an embodiment comprises: a drive panelincluding a plurality of organic electroluminescence devices with afirst electrode, one or more organic layers including a light-emittinglayer, and a second electrode laminated in order on a substrate fordrive, and extracting light generated in the light-emitting layer fromthe side of the second electrode; a sealing panel with a color filterdisposed on a substrate for sealing, and facing the drive panel on theside of the second electrode; and an adhesive layer disposing betweenthe sealing panel and the drive panel so as to cover the plurality oforganic electroluminescence devices, and the adhesive layer being curedwith at least heat.

In the display apparatus of the embodiment, the color filter is disposedon the substrate for sealing, so even if external light incident fromthe sealing panel is reflected on the organic electroluminescencedevices, etc., the light is prevented from being emitted from thesealing panel and thereby the contrast can be improved. Moreover, theadhesive layer is disposed so as to cover the organicelectroluminescence devices, so the organic electroluminescence devicesare securely sealed. Further, the adhesive layer is cured with heat, soby the adhesive layer with excellent and stable adhesive properties, thedrive panel and the sealing panel are easily bonded together, regardlessof the presence or absence of the color filter.

Additional features and advantages are described herein, and will beapparent from the following Detailed Description and the figures.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross sectional view of a display apparatus according to afirst embodiment;

FIG. 2 is an enlarged cross sectional view of an organicelectroluminescence device in the display apparatus shown in FIG. 1;

FIG. 3 is an enlarged cross sectional view of another organicelectroluminescence device in the display apparatus shown in FIG. 1;

FIG. 4 is a plan view of a color filter in the display apparatus shownin FIG. 1 viewed from the side of a drive panel;

FIGS. 5A through 5C are cross sectional views sequentially showing stepsof manufacturing the display apparatus shown in FIG. 1;

FIGS. 6A through 6C are cross sectional views showing steps followingthe step in FIG. 5C;

FIGS. 7A and 7B are cross sectional views showing steps following thestep in FIG. 6C;

FIG. 8 is a cross sectional view showing a step following the step inFIG. 7B; and

FIG. 9 is a cross sectional view of a display apparatus according to asecond.

DETAILED DESCRIPTION

Preferred embodiments are described in more detail below referring tothe accompanying drawings.

[First Embodiment]

FIG. 1 shows a cross sectional view of a display apparatus according toa first embodiment. The display apparatus is used as an ultra-thinorganic EL color display, etc., and in the display apparatus, forexample, a drive panel 10 and a sealing panel 20 faces each other andthe whole facing surfaces thereof are bonded together with an adhesivelayer 30. The drive panel 10 includes an organic electroluminescencedevice 10R emitting red light, an organic electroluminescence device 10Gemitting green light and an organic electroluminescence device 10Bemitting blue light disposed in order in a matrix shape as a whole on asubstrate for drive 11 made of, for example, an insulating material suchas glass.

Each of the organic electroluminescence devices 10R, 10G and 10Bincludes, for example, an anode 12 as a first electrode, an insulatinglayer 13, an organic layer 14 and a cathode 15 as a second electrodelaminated in this order from the side of the substrate for drive 11. Theanode 12 and the cathode 15 are shared among the organicelectroluminescence devices 10R, 10G and 10B in the direction.orthogonal to each other, and have a function as wiring to supply acurrent to the organic electroluminescence devices 10R, 10G and 10B.

The anode 12 has a thickness in a laminating direction (hereinaftersimply referred to as thickness) of approximately 200 nm, for example,and is made of a metal such as platinum (Pt), gold (Au), silver (Ag),chromium (Cr) or tungsten (W), or an alloy thereof.

The insulating layer 13 is provided to secure the insulation between theanode 12 and the cathode 15, and to accurately form light-emitting areasin the organic electroluminescence devices 10R, 10G and 10B into desiredshapes. The insulating layer 13 has a thickness of approximately 600 nm,for example, and is made of an insulating material such as silicondioxide (SiO2). The insulating layer 13 includes an aperture portion 13Acorresponding to the light-emitting area.

The organic layer 14 has a different structure for each of the organicelectroluminescence devices 10R, 10G and 10B. FIG. 2 shows an enlargedview of the organic layer 14 in the organic electroluminescence devices10R and 10G. In the organic electroluminescence devices 10R and 10G, theorganic layer 14 includes a hole injection layer 14A, a hole transportlayer 14B and a light-emitting layer 14C, each of which is made of anorganic material, laminated in this order from the side of the anode 12.The hole injection layer 144. and the hole transport layer 14B areprovided to improve the hole injection efficiency into thelight-emitting layer 14C. The light-emitting layer 14C emits light bythe injection of current, and emits light in an area corresponding tothe aperture portion 13A of the insulating layer 13.

In the organic electroluminescence device 10R, the hole injection layer14A has a thickness of, for example, approximately 30 nm, and is made of4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (MTDATA). The holetransport layer 14B has a thickness of, for example, approximately 30nm, and is made of bis[(N-naphthyl)-N-phenyl]benzidine (a-NPD). Thelight-emitting layer 14C has a thickness of, for example, approximately40 nm, and is made of a 8-quinolinol aluminum complex (Alq) blended with2% by volume of4-dicyanomethylene-6-(pdimethylaminostyryl)-2-methyl-4H-pyran. (D CM).

In the organic electroluminescence device 10G, the hole injection layer14A and the hole transport layer 14B are made of the same materials asthose in the organic electroluminescence device 10R. The hole transportlayer 14A has a thickness of, for example, approximately 30 nm, and thehole transport layer 14B has a thickness, for example, approximately 20nm. The light-emitting layer 14C has a thickness of, for example,approximately 50 nm, and is made of a 8-quinolinol aluminum complex(Alq).

FIG. 3 shows an enlarged view of the organic layer 14 in the organicelectroluminescence device 10B. In the organic electroluminescencedevice 10B, the organic layer 14 includes the hole injection layer 14A,the hole transport layer 14B, the light-emitting layer 14C and anelectron transport layer 14D, each of which is made of an organicmaterial, laminated in this order from the. side of the anode 12. Theelectron transport layer 14D is provided to improve the electroninjection efficiency into the light-emitting layer 14C.

In the organic electroluminescence device 10B, the hole injection layer14A and the hole transport layer 14B are made of the same materials asthose in the organic electroluminescence devices 10R and 10G. The holetransport layer 14A has a thickness of, for example, approximately 30nm, and the hole transport layer 14B has a thickness of, for example,approximately 30 nm. The light-emitting layer 14C has a thickness of,for example, approximately 15 nm, and is made of bathocuproin (BCP). Theelectron transport layer 14D has a thickness of, for example,approximately 30 nm, and is made of Alq.

As shown in FIGS. 2 and 3, the cathode 15 includes a semitransparentelectrode 15A having semi-transparency for light generated in thelight-emitting layer 14C, and a transparent electrode havingtransmittance for the light generated in the light-emitting layer 14C,which are laminated in this order from the side of the organic layer 14.Thereby, the drive panel 10 extracts the light generated in thelight-emitting layer 14C from the side of the cathode 15 as shown byarrows with dashed lines in FIGS. 1 through 3.

The semi-transparent electrode 15A has a thickness of, for example,approximately 10 nm, and is made of an alloy of magnesium (Mg) andsilver (MgAg alloy). The semi-transparent electrode 15A is provided toreflect the light generated in the light-emitting layer 14C between theanode 12 and the semi-transparent electrode 15A. In other words, thesemi-transparent electrode 15A and the anode 12 constitute a resonantportion in a resonator which resonates the light generated in thelight-emitting layer 14C. It is preferable that such a resonator isconstituted, because the light generated in the light-emitting layer 14Ccauses multiple interference to function as a kind of narrow-bandfilter, and thereby the half-value width of the spectrum of extractedlight is reduced and color purity is improved. Further, it is preferablebecause external light incident from the sealing panel 20 can beattenuated by the multiple interference, and the reflectance of theexternal light on the organic electroluminescence devices 10R, 10G and10B can become extremely small by a combination of a color filter 22(refer to FIG. 1) to be described later.

For that purpose, it is preferable to match the peak wavelength of thenarrow-band filter and the peak wavelength of the spectrum of lightdesired to be extracted. In other words, assuming that the phase shiftof reflected light generated in the anode 12 and the semi-transparentelectrode 15A is (13 (rad), the optical distance between the anode 12and the semi-transparent electrode 15A is L, and the peak wavelength ofthe spectrum of light desired to be extracted from the side of thecathode 15 is X, the optical distance L preferably satisfies amathematical formula 1, and in face,—the optical distance L ispreferably selected to be a positive minimum value satisfying themathematical formula 1. Further, in the mathematical formula 1, theunits of L and X may be the same, for example, “nm”.2L/X4−43/27t=q (q is an integer)   (Mathematical Formula 1)

The transparent electrode 15B is provided to reduce the electricalresistance of the semi-transparent electrode 15A, and is made of anelectrically conductive material having sufficient translucency to thelight generated in the light-emitting layer 14C. As the material of thetransparent electrode 15B, for example, a compound including indium,zinc (Zn) and oxygen is preferable, because the compound can obtain goodelectrical conductivity even if film formation is carried out at ambienttemperature. It is preferable that the thickness of the transparentelectrode 15B is, for example, approximately 200 nm.

As shown in FIG. 1, the sealing panel 20 is disposed on the side of thecathode 15 of the drive panel 10, and includes a substrate for sealing21 to seal the organic electroluminescence devices 10R, 10G and 10Btogether with an adhesive layer 30. The substrate for sealing 21 is madeof a material transparent to light generated in the organicelectroluminescence device 10R, 10G and 10B, such as glass. In thesubstrate for sealing 21, for example, the color filter 22 and areflected-light absorbing film 23 as a black matrix are disposed toextract the light generated in the organic electroluminescence devices10R, 10G and 10B, and to absorb external light reflected on theelectroluminescence devices 10R, 10G and 10B as well as the anode 12 andthe cathode 15 which are positioned in between as wiring, so that thecontrast is improved.

The color filter 22 and the reflected-light absorbing film 23 may bedisposed on either side of the substrate for sealing 21, but preferablythey are disposed on the side facing the drive panel 10, because thecolor filter 22 and the reflected-light absorbing film 23 are notexposed to the surface and can be protected by the adhesive layer 30.The color filter 22 includes a red filter 22R, a green filter 22G andblue filter 22B which are disposed corresponding to the organicelectroluminescence devices 10R, 10G and 10B, respectively.

FIG. 4 shows a plan view of the color filter 22 viewed from the side ofthe drive panel 10. Further, in FIG. 4, in order to easily identify thered filter 22R, the green filter 22G and the blue filter 22B, the redfilter 22R, the green filter 22G and the blue filter 22B are indicatedwith vertical lines, oblique lines and horizontal lines, respectively.

The red filter 22R, the green filter 22G and the blue filter 22B eachhave, for example, a rectangular shape, and are formed with no space inbetween. The red filter 22R, the green filter 22G and the blue filter22B each are made of a resin mixed with pigments, and by the selectionof the pigments, the light transmittance in a targeted wavelength ofred, green or blue is adjusted to be higher, and the light transmittancein the other wavelengths is adjusted to be lower.

As shown in FIGS. 1 and 4, the reflected-light absorbing film 23 isdisposed along the boundaries among the red filter 22R, the green filter22G and the blue filter 22B. The reflected-light absorbing film 23 ismade of a black resin film containing, for example, a black colorantwith an optical density of 1 or more, or a thin film filter using theinterference of a thin film. More preferably, the reflected-lightabsorbing film 23 is made of the black resin film, because thereflected-light absorbing film 23 can be easily formed at low cost. Thethin film filter is made of a laminate including one or more layers ofthin films of, for example, metal, a metal nitride or a metal oxide soas to attenuate light by the use of the interference of the thin films.A laminate of chromium and chromium oxide (III) (Cr₂O₃) in alternateorder is taken as a specific example of the thin film filter.

As shown in FIG. 1, the adhesive layer 30 covers the whole surface ofthe drive panel 10 on the side where the organic electroluminescencedevices 10R, 10G and 10B are disposed so as to more effectively preventcorrosion and damage of the organic electroluminescence devices 10R, 10Gand 10B. The adhesive layer 30 is cured with at least heat. In otherwords, at least a part of the adhesive layer 30, more specifically atleast a portion of the adhesive layer 30 covering the organicelectroluminescence devices 10R, 10G and 10B is a portion 30B cured withheat. The portion 30B cured with heat is made of, for example, athermosetting resin such as a phenol resin, a melanin resins anunsaturated polyester resin, an epoxy resin, a silicon resin, apolyurethane resin or the like.

A temporary fixing portion 30A is formed in a part of an edge portion ofthe adhesive layer 30. The temporary fixing portion 30A is made of, forexample, an ultraviolet cure resin, and is formed so as to straddlebetween the sealing panel 20 and the drive panel 10. The temporaryfixing portion 30A is provided to align the relative position of thesealing panel 20 with the drive panel 10.

The display apparatus can be manufactured through, for example, thefollowing steps.

FIGS. 5A through 7B show a method of manufacturing the display,apparatus step by step. First, as shown in FIG. 5A, the reflected-lightabsorbing film 23 made of the above-described material is formed on thesubstrate for sealing 21 made of the above-described material, and thenis patterned into the shape shown in FIG. 4. Next, as shown in FIG. 5B,the material of the red filter 22R is coated on the substrate forsealing 21 through a spin coat method or the like, and then the materialof the red filter 22R is patterned and fired through photolithography toform the red filter 22R. It is preferable that an edge portion of thered filter 22R covers the reflected-light absorbing film 23 duringpatterning, because it is difficult to pattern the red filter 22R withhigh accuracy so as not to cover the reflected-light absorbing film 23,and a portion overlaid on the reflected-light absorbing film 23 does notaffect the display of an image. Then, as shown in FIG. 5C, like the redfilter 22R, the blue filter 22B and the green filter 22G are formed inorder. Thereby, the sealing panel 20 is formed.

Further, as shown in FIG. 6A, for example, a plurality of anodes 12 madeof the above-described material are formed in-parallel on the substratefor drive. 11 made of the above-described material through, for example,direct current sputtering. Then, the insulating layer 13 of theabove-described thickness is formed on the anodes 12 through, forexample, CVD (chemical vapor deposition), and a portion of theinsulating layer 13 corresponding to a light-emitting area isselectively removed through lithography to form the aperture portion13A.

Next, as shown in FIG. 6B, corresponding to the aperture portion 13A ofthe insulating layer 13, the hole injection layer 14A, the holetransport layer 14B, the light-emitting layer 14C and the electrontransport layer 14D, each of which is made of the above-describedmaterial and has the above-described thickness, are formed in order bythe use of an area mask (not shown) through, for example, vapordeposition. At this time, the area mask is changed depending upon theorganic electroluminescence devices 10R, 10G and 10B to form the layers.Further, it is difficult to carry out vapor deposition only on theaperture portion 13A with high accuracy, so it is preferable that eachlayer is formed so as to cover the whole aperture portion 13A andslightly cover the edge of the insulating layer 13. After forming theorganic layer 14, a plurality of semi-transparent electrodes 15A whichhave the above-described thickness and are made of the above-describedmaterial are formed in parallel in the direction perpendicular to theanodes 12 by the use of the area mask (not shown) through, for example,vapor deposition. After that, on the semitransparent electrodes 15A, thetransparent electrodes 15B are formed through, for example, directcurrent sputtering by the use of the same area mask used when thesemi-transparent electrodes 15A are formed. Thereby, the drive panel 10is formed.

After forming the sealing panel 20 and the drive panel 10, as shown inFIG. 6C, for example, a thermosetting resin is coated on a surface ofthe substrate for drive 11 where the organic electroluminescence devices10R, 10G and 10B are formed so as to form the portion 30B cured withheat in the adhesive layer 30. The step of coating may be carried outthrough, for example, discharging the resin from a slit nozzle typedispenser, roll coating or screen printing. For the portion 30B curedwith heat in the adhesive layer 30, one coating liquid or a combinationof two coating liquids is used for curing. Further, in the case of acombination of two or more coating liquids, the coating liquids may becoated at the same time or separately in any order. When coating thecoating liquids at the same time, a mixture of the coating liquids maybe coated, or the coating liquids may be coated at the same time so asto be mixed. When coating the coating liquids separately, after thecoating liquids are coated in order, the liquids may be mixed by, forexample, the application of pressure caused by bonding the sealing panel20 and the drive panel 10 together.

Next, as shown in FIG. 7A, the drive panel 10 and the sealing panel 20are bonded together with the adhesive layer 30 in between. At this time,it is preferable that a surface of the sealing panel 20 on the sidewhere the color filter 22 and the reflected-light absorbing film 23 areformed is disposed so as to face the drive panel 10. Further, it ispreferable not to enter air bubbles into the adhesive layer 30.

Then, as shown in FIG. 7B, for example, the sealing panel 20 is moved ina direction indicated with an arrow to align the relative positionbetween the sealing panel 20 and the drive panel 10. In other words, thepositions of the organic electroluminescence devices 10R, 10G and 10Band the color filter 22 are aligned. At this time, the adhesive layer 30is not yet cured, so the relative position between the sealing panel 20and the drive panel 10 can be moved approximately a few hundred Rm. Therelative position between the sealing panel 20 and the drive panel 10 isaligned to temporarily fix the sealing panel 20. For example, anultraviolet cure resin is coated on at least a part of the edge portionof the adhesive layer 30 so as to straddle between the sealing panel 20and the drive panel 10, and the ultraviolet radiation UV is applied fromthe side of the sealing panel 20 to cure the ultraviolet cure resin,thereby the temporary fixing portion 30A is formed so as to be capableof temporarily fixing the sealing panel 20.

Finally, as shown in FIG. 8, the adhesive layer 30 is heated to anappropriate temperature to be cured, and thereby the drive panel 10 andthe sealing panel 20 are bonded together. The curing temperature can beappropriately determined depending upon the heating time, such as 80° C.for a heating time of 2 hours and 60° C. for a heating time of 4 hours.Thus, the display apparatus shown in FIGS. 1 through 4 is completed.

In the display apparatus manufactured through the above steps, when apredetermined voltage is applied between the anode 12 and the cathode15, a current is injected into the light-emitting layer 14C, and holesand electrons are bonded again to emit light mainly in an interface onthe light-emitting layer 14C. The light is reflected several timesbetween the anode 12 and the semi-transparent electrode 15A, and passesthrough the cathode 15, the adhesive layer 30, the color filter 22 andthe substrate for sealing 21 to be extracted from the side of sealingpanel 20. In the embodiment, as the color filter 22 and thereflected-light absorbing film 23 are disposed on the sealing panel 20,external light incident from the sealing panel 20 is prevented frombeing reflected on the organic electroluminescence devices 10R, 10G and10B and then being emitted from the sealing panel 20, thereby thecontrast can be improved.

Moreover, in the embodiment, in each of the organic electroluminescencedevices 10R, 10G and 10B, the resonator including the semi-transparentelectrode 15A and the anode 12 as a resonant portion is constituted, soby multiple interference, the half-value width of the spectrum ofextracted light can be reduced, and color purity can be improved, aswell as external light is attenuated, and the reflectance of theexternal light is reduced by a combination of the color filter 22. Inother word, the contrast can be further improved.

Thus, according to the embodiment, the color filter 22 is disposed onthe substrate for sealing 21, and the sealing panel 20 and the drivepanel 10 are bonded together with the adhesive layer 30 disposed so asto cover the organic electroluminescence devices 10R, 10G and 10B, soexternal light incident from the sealing panel 20 can be prevented frombeing reflected on the organic electroluminescence devices 10R, 10G, 10Band so on, and then being emitted from the sealing panel 20. Therefore,the contrast can be improved. Moreover, the adhesive layer 30 cansecurely seal the organic electroluminescence devices 10R, 10G and 10B,so the organic electroluminescence devices 10R, 10G and 10B can beeffectively prevented from corrosion and damage. Further, the adhesivelayer 30 is cured with heat, so the drive panel 10 and the sealing panel20 are easily bonded together with the adhesive layer 30 havingexcellent and stable adhesive properties, regardless of the presence orthe absence of the color filter 22.

Still further, the temporary fixing portion 30A is formed in a part ofthe edge portion of the adhesive layer 30 to align the relative positionof the sealing panel 20 with the drive panel 10, so more accuratealignment can be carried out. In addition, the temporary fixing portion30A is made of an ultraviolet cure resin, so the temporary fixingportion 30A can be cured at a lower temperature for a shorter time.Thereby, temporary fixation can be carried out with ease and accuracy.

Moreover, when each of the organic electroluminescence devices 10R, 10Gand 10B have the resonator including the semi-transparent electrode 15Aand the anode 12 as a resonant portion, multiple interference of lightgenerated in the light-emitting layer 14C arises to function as a kindof narrow-band filter, so the half-value width of the spectrum ofextracted light can be reduced, and color purity can be improved.Further, external light incident from the sealing panel 20 can beattenuated by the multiple interference, so by a combination of thecolor filter 22, the reflectance of the external light on the organicelectroluminescence devices 10R, 10G and 10B can become extremely small.Therefore, the contrast can be further improved.

[Second Embodiment]

FIG. 9 shows a display apparatus according to a second embodiment. Thedisplay apparatus is equivalent to the display apparatus described inthe first embodiment except that an antireflective film 24 is disposedon a surface of the substrate for sealing 21 on the opposite side of thedrive panel 10. Therefore, like components are denoted by like numeralsas of the first embodiment and will not be further explained.

The antireflective film 24 is provided to prevent surface reflection ofexternal light on the substrate for sealing 21. When the substrate forsealing 21 is made of, for example, glass, the surface reflectionthereof is approximately 4%, because when the reflection of the externallight inside the display apparatus is inhibited by the color filter 22,the reflected-light absorbing film 23 and so on, the surface reflectionon the substrate for sealing 21 is not negligible.

The antireflective film 24 is preferably made of a thin film filterincluding a laminate of, for example, silicon oxide (SiO₂), and titaniumoxide (TiO₂) or niobium oxide (Nb₂O₅).

Thus, according to the embodiment, in addition to effects described inthe first embodiment, as the antireflective film 24 is disposed on thesubstrate for sealing 21, the surface reflection of the external lighton the substrate for sealing 21 can be reduced, thereby the contrast canbe further improved. Incidentally, as of the above first embodiment, theadhesive layer 30 is cured with heat, and the second embodiment providesthe effects equal to those of the above first embodiment.

In the above embodiments, although the case that the color filter 22 andthe reflected light absorbing film 23 are disposed on the substrate forsealing 21 is described, the reflected-light absorbing film 23 may ormay not be disposed as required.

Moreover, in the above embodiments, the adhesive layer 30 is disposed onthe whole surface of the drive panel 10, but the adhesive layer 30 maybe disposed to cover at least the organic electroluminescence devices10R, 10G and 10B. Further, in the above embodiments, the temporaryfixing portion 30A is disposed in a part of the edge portion of theadhesive layer 30, but the temporary fixing portion 30A may be disposedon, for example, the whole edge portion of the adhesive layer 30 so asto surround the adhesive layer 30.

In addition, in the above embodiments, the structures of the organicelectroluminescence devices 10R, 10G and 10B are described referring tospecific components. However, the organic electroluminescence devices10R, 10G and 10B may not include all layers such as the insulating layer13—or the transparent electrode 15B, or may further include any otherlayers. The embodiments are applicable to the case where thesemitransparent electrode 15A is not included, although as described inthe above embodiments, the resonator with the semi-transparent electrode15A and the anode 12 as a resonance portion is preferably included,because the reflectance of the external light on the organicelectroluminescence devices 10R, 10G and 10B can be further reduced, andthereby the contrast can be further improved.

Still further, in the above embodiments, the first electrode is theanode, and the second electrode is the cathode, but the first electrodemay be the cathode and the second electrode may be the anode. In thiscase, light is extracted from the side of the anode, and the anode ismade of a semi-transparent electrode, a transparent electrode or thelike.

Moreover, in the above embodiments, the material of the organic layer 14is changed so as to emit red, green or blue light, however, theembodiments are applicable to a display apparatus which emits theselight by a combination of color changing mediums (CCM) or a combinationof color filters.

As described above, according to the display apparatus of theembodiments, the drive substrate including the organicelectroluminescence devices and the substrate for sealing including thecolor filter are bonded together with at least the adhesive layer whichis cured with heat, so by the adhesive layer having excellent and stableadhesive properties, the drive panel and the sealing panel can be easilybonded together, and thereby, the display apparatus of the type thatlight is extracted from the side of the second electrode can be easilyimplemented.

More specifically, according to the display apparatus of an embodiment,the temporary fixing portion is formed in at least a part of the edgeportion of the adhesive layer so as to straddle between the sealingpanel and the drive panel, and aligns the relative position of thesealing panel with the drive panel, so more accurate alignment can becarried out. Moreover, according to the display apparatus of anotheraspect of the embodiment, the temporary fixing portion is made of anultraviolet cure resin, so the temporary fixing portion can be cured ata lower temperature for a shorter time, thereby temporary fixation canbe carried out with ease and accuracy.

In addition, according to the display apparatus of still another aspectof the embodiment, the antireflective film is disposed on the substratefor sealing, so the surface reflection of the external light on thesubstrate for sealing can be reduced, and thereby the contrast can befurther improved.

Further, according to the display apparatus of a further aspect of theembodiment, the semi-transparent electrode and the first electrodeconstitute a resonant portion of the resonator, so the multipleinterference of light generated in the light-emitting layer arises tofunction as a kind of narrow-band filter. Thereby, the half-value widthof the spectrum of extracted light can be reduced, and color purity canbe improved. In addition, the external light incident from the sealingpanel can be attenuated by the multiple interference, and by acombination of the color filter, the reflectance of the external lighton the organic electroluminescence devices can become extremely small.Therefore, the contrast can be further improved.

Obviously many modifications and variations of the present embodimentare possible in the light of the above teachings. It is therefore to beunderstood that within the scope of the appended claims the inventionmay be practiced otherwise than as specifically described.

It should be understood that various changes and modifications to thepresently preferred embodiments described herein will be apparent tothose skilled in the art. Such changes and modifications can be madewithout departing from the spirit and scope of the present subjectmatter and without diminishing its intended advantages. It is thereforeintended that such changes and modifications be covered by the appendedclaims.

The invention is claimed as follows:
 1. A display apparatus, comprising:a drive panel including a plurality of organic electroluminescencedevices, each organic electroluminescence device including a firstelectrode, one or more organic layers including a light-emitting layer,and a second electrode; a sealing panel that seals and faces the drivepanel at a side of the second electrode; and an adhesive memberincluding a first adhesive portion that is comprised of an ultravioletcuring material and a second adhesive portion that is comprised of aheat-curable material.
 2. The display apparatus according to claim 1,wherein at least one peripheral edge of the first adhesive portion isexposed.
 3. The display apparatus according to claim 2, wherein at leastone peripheral edge of the second adhesive member is exposed.
 4. Thedisplay apparatus according to claim 1, wherein the second adhesiveportion covers the plurality of organic electroluminescence devices andextends from the drive panel to the sealing panel.
 5. The displayapparatus according to claim 1, wherein the first adhesive portionextends from the drive panel to the sealing panel.
 6. The displayapparatus according to claim 1, wherein the first adhesive portion andthe second adhesive portion extend from the drive panel to the sealingpanel.
 7. The display apparatus according to claim 1, wherein the firstadhesive portion is formed on and directly contacts at least oneperipheral edge of the second adhesive portion.
 8. A display apparatuscomprising: a single drive panel including a plurality of organicelectroluminescence devices, each organic electroluminescence deviceincluding a first electrode, one or more organic layers including alight-emitting layer, and a second electrode; a single sealing panelthat seals and faces the drive panel at a side of the second electrode;and a heat-curable adhesive that covers the plurality of organicelectroluminescence devices, and that extends from the drive panel tothe sealing panel.
 9. The display apparatus according to claim 8,wherein the sealing panel includes a color filter.
 10. The displayapparatus according to claim 8, wherein the sealing panel includes areflected light absorbing film.
 11. The display apparatus according toclaim 8, wherein light generated in the light-emitting layer is emittedfrom the side of the second electrode.